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Title

Different Modes of Interaction in Cyanobacterial Complexes of Plastocyanin and Cytochrome f

AuthorsDíaz-Moreno, Irene CSIC ORCID; Díaz-Quintana, Antonio; Rosa, Miguel A. de la CSIC ORCID; Crowley, Peter B.; Ubbink, Marcellus
KeywordsElectron transfer
Photosynthesis
Plastocyanin
Cytochrome f
Cyanobacterium
Nostoc
Issue DateFeb-2005
PublisherAmerican Chemical Society
CitationBiochemistry 44(9): 3176-3183 (2005)
AbstractThe highly efficient electron-transfer chain in photosynthesis demonstrates a remarkable variation among organisms in the type of interactions between the soluble electron-transfer protein plastocyanin and it partner cytochrome f. The complex from the cyanobacterium Nostoc sp. PCC 7119 was studied using nuclear magnetic resonance spectroscopy and compared to that of the cyanobacterium Phormidium laminosum. In both systems, the main site of interaction on plastocyanin is the hydrophobic patch. However, the interaction in the Nostoc complex is highly dependent on electrostatics, contrary to that of Phormidium, resulting in a binding constant that is an order of magnitude larger at low ionic strength for the Nostoc complex. Studies of the mixed complexes show that these differences in interactions are mainly attributable to the surface properties of the plastocyanins.
Description8 páginas, 6 figuras, 1 tabla
Publisher version (URL)http://dx.doi.org/10.1021/bi047855z
URIhttp://hdl.handle.net/10261/33655
DOI10.1021/bi047855z
ISSN0006-2960
E-ISSN1520-4995
Appears in Collections:(IBVF) Artículos

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